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java.lang.Objectorg.apache.hadoop.hbase.filter.PageRowFilter
public class PageRowFilter
Implementation of RowFilterInterface that limits results to a specific page size. It terminates scanning once the number of filter-passed results is >= the given page size.
Note that this filter cannot guarantee that the number of results returned to a client are <= page size. This is because the filter is applied separately on different region servers. It does however optimize the scan of individual HRegions by making sure that the page size is never exceeded locally.
Constructor Summary | |
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PageRowFilter()
Default constructor, filters nothing. |
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PageRowFilter(long pageSize)
Constructor that takes a maximum page size. |
Method Summary | |
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boolean |
filter(org.apache.hadoop.io.Text rowKey)
Filters on just a row key. |
boolean |
filter(org.apache.hadoop.io.Text rowKey,
org.apache.hadoop.io.Text colKey,
byte[] data)
Filters on row key and/or a column key. |
boolean |
filterAllRemaining()
Determines if the filter has decided that all remaining results should be filtered (skipped). |
boolean |
filterNotNull(SortedMap<org.apache.hadoop.io.Text,byte[]> columns)
Filters a row if: 1) The given row (@param columns) has a columnKey expected to be null AND the value associated with that columnKey is non-null. |
boolean |
processAlways()
Returns whether or not the filter should always be processed in any filtering call. |
void |
readFields(DataInput in)
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void |
reset()
Resets the state of the filter. |
void |
rowProcessed(boolean filtered,
org.apache.hadoop.io.Text rowKey)
Called to let filter know the final decision (to pass or filter) on a given row. |
void |
validate(org.apache.hadoop.io.Text[] columns)
Validates that this filter applies only to a subset of the given columns. |
void |
write(DataOutput out)
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PageRowFilter()
public PageRowFilter(long pageSize)
pageSize
- Maximum result size.Method Detail |
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public void validate(org.apache.hadoop.io.Text[] columns)
validate
in interface RowFilterInterface
public void reset()
reset
in interface RowFilterInterface
public void rowProcessed(boolean filtered, org.apache.hadoop.io.Text rowKey)
rowProcessed
in interface RowFilterInterface
RowFilterSet
public boolean processAlways()
processAlways
in interface RowFilterInterface
public boolean filterAllRemaining()
filterAllRemaining
in interface RowFilterInterface
public boolean filter(org.apache.hadoop.io.Text rowKey)
filter
in interface RowFilterInterface
public boolean filter(org.apache.hadoop.io.Text rowKey, org.apache.hadoop.io.Text colKey, byte[] data)
filter
in interface RowFilterInterface
rowKey
- row key to filter on. May be null for no filtering of row key.colKey
- column whose data will be filtereddata
- column value
public boolean filterNotNull(SortedMap<org.apache.hadoop.io.Text,byte[]> columns)
filterNotNull
in interface RowFilterInterface
public void readFields(DataInput in) throws IOException
readFields
in interface org.apache.hadoop.io.Writable
IOException
public void write(DataOutput out) throws IOException
write
in interface org.apache.hadoop.io.Writable
IOException
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